Insights for Workability
Introduction to Student Chapters. Join a Technical Committee. Registration is now open. Please click here to register. Objectives While current ACI competitions focus mainly on strength or hardened concrete performance, this competition will focus on workability and rheological properties of cement-based materials.
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Prizes Flowability, mixture stability, cost of the mixture, and quality of the written report will be used to determine the winners of the competition. Eligibility Each team must consist of students in high school, technical school, trade school, or undergraduate students of a college or university at the time of the competition. Undergraduate students on cooperative or internship work assignment are also eligible to compete. All members of a given team must be from the same school.
A team is limited to eight individuals. Each school may register only one team. Each team must have a supervising faculty advisor who will see that the student team complies with the rules of the competition. Since this competition involves mixing and pouring of mixture at the convention, it is required that at least two team members be present at the convention to participate in the mixing, pouring, and cleanup during the competition.
Participation by additional team members is both permitted and encouraged, though a maximum of 4 students will be allowed to mix mortar in order to maintain a safe working area. Please note that previously for this competition there have been many teams disqualified due to non-compliance with the rules. Please review the rules carefully, taking special note of the allowable materials and requirements for aggregate composition and water content. Material All material requirements indicated below should be closely followed and all materials and the mix design used in the competition are to be clearly described in the Written Report see Section 3.
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The mortar must use cementitious materials as binder, as defined in Section 2. If no pure Portland cement is available in the region of the competing team, a blended cement may be used, provided the amount of SCM in the cement does not exceed the limiting quantity. Product information sheets must be included in the report. If the quantity of SCM is stated to be in a certain range, the maximum value shall be assumed for this competition. The cost of a blended cement is considered to be equal to the cost of a pure Portland cement.
Blended cement shall not be used, except if no pure Portland cement is available, as discussed in 2. Nano-materials shall only be used in aqueous suspensions. The maximum ratio between water and cementitious materials plus mineral fillers is 0. The mix design needs to be reported in SSD conditions. The aggregate needs to be delivered at or below SSD condition at the moment of the competition. No water shall be added to correct for a moisture condition , as it is uncertain how much of the water will be absorbed by the aggregate.
The mass of aggregate min. Written Report Teams shall submit a unique written report meeting the requirements listed below for the judges to review and score. Table 2 shows the point allocation that the judges will use to score the report: All materials , except water and admixtures, are to be pre-weighed, bagged individually , and brought to the competition. Admixtures may be measured at the competition site but must be supplied by the team. The competition organizer will prepare appropriate measures for water measurement on-site. The chemical admixtures can only be measured by means of a syringe provided by the team by volume on site.
The judges will inspect both sets of raw materials and verify compliance with the rules, including the amount and gradation requirements. Both sets of identical raw materials shall comply with the rules see Section 8. Note that in order to ensure all raw materials arrive on time, all teams are strongly encouraged to contact their traveling companies regarding regulations of baggage and carry-on allowance, particularly liquid—that is, chemical admixture s —prior to their travels.
The judges will randomly select one set of the raw materials for mixing. Mixing If necessary, a judge will verify the water content of the sand by means of the procedure described in ASTM C If the judges deem that the aggregate is above SSD condition the sand does not slump , the team will be disqualified. All bagged materials will be weighed by a judge prior to mixing. The entire quantity of each bag containing solid materials must be added to the mixer. In other words, teams are required to provide all solid materials, pre-weighed in separate bags for each material, and no adjustment to the quantity of solid materials can be made on-site.
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The teams have 5 minutes to prepare the water and admixture quantities on-site. A standard 5 qt laboratory mixer provided by the competition organizer, is to be used for mixing. Each team will be responsible to mix their own mixture on-site. It is recommended to follow ASTM C; however, a team can decide their own mixing procedure, based on the selected mixing procedure as described in the written report. The maximum mixing speed on the mixer is not allowed to be used.
A maximum of 10 min is allowed for each team to have their mixtures prepared and handed to the judges. The 10 min period starts either when turning on the mixer or when adding the mixing water to the mixer bowl. Should the team determine that the workability of their mixture does not meet their expectation, the team will be allowed to adjust the quantity of 1 one chemical admixture, employed in the reported mortar mixture, relative to the mix design reported by the team. Multiple additions of the same chemical admixture are allowed, as long as the total mixing time does not exceed the maximum of 10 ten min as specified in section 4.
Each addition should be reported to the judge. Failure to report each addition, exceed the maximum of 10 min allowed mixture preparation time, the adjustment with multiple chemical admixtures on site , or the use of a chemical admixture which is not incorporated in the reported mortar mix design will lead to disqualification of the team. Upon completion of mixing, the bowl with the mixture shall be weighted.
The mass of the bowl determined before the competition will be subtracted. The volume of the mortar will be derived from the mass based on the density or relative density specific gravity of the mixture, which will be taken from the submitted report. If the volume of the mixture is out of the allowable limits: The latter container of mixture is to be used for the flowability test see Section 4.
Each team is then to deposit the surplus mixture into the designated cleanup area. The team is responsible for cleaning the mixing bowl, paddles, and any other tools used in mixing appropriately. An additional 10 min is allowed for cleanup time. Teams failing to properly cleanup will be disqualified from the competition. Mixture from the second filled container as prepared in Section 4. Within 3 min after the mixture is delivered to the judges, judges will pour the mixture into the aci mold through a funnel with an opening of approximately 12 mm.
A detailed drawing of the mold can be found in Appendix B. Molds will be provided at the competition site.
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Students may use the drawing to fabricate their own mold for testing at their own school, although the competition molds may not behave exactly similar to school training molds. A maximum of 3 min will be allowed for the mixture to flow through the mold. If the mixture is not able to fully fill the mold, the degree of mixture filling the mold will be recorded.
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